Planet of the Spiders - S11-E5
Corrected entry: Neither the humans nor Spiders use the word "Spider", instead referring to them as "Eight-Legs". But when the colonists go off to attack the Spider lair, you can hear some of the extras shouting "Death to the Spiders" instead of "Death to the Eight-Legs".
Planet of the Spiders - S11-E5
Corrected entry: Near the end of episode five, Tommy rescues the Doctor and Sarah from the cellar. The spider-controlled men pursue and start banging on the cellar door. When they do, it wobbles quite a bit.
Correction: Doors often wobble if hammered on, particularly old ones. Not a mistake.
Correction: That's the entire point of the scene. They are rebelling against the spiders and using the forbidden word as an act of defiance.